Khan Academy Static

After using your jeans for a while, you’ll begin to notice small tears and rips developing in the fabric. Why doesn’t this happen to your heart as well? Well, your heart manages to stay healthy despite all of the “wall stress” that pulls on the heart walls. During different parts of the heart cycle (afterload vs. preload) the mechanics of “wall stress” change dramatically. Learn exactly what preload and afterload mean, and how we can use pressure-volume loops to estimate their values.

15943_Frank_Starling_mechanism.html

15947_Increasing_the_heart_s_force_of_contraction.html

15945_Active_contraction_vs_passive_recoil.html

15942_Preload_stretches_out_the_heart_cells.html

15946_What_is_afterload_.html

15939_Why_doesn_t_the_heart_rip_.html

15941_Preload_and_pressure.html

15940_What_is_preload_.html

15944_Sarcomere_length_tension_relationship.html